Fionn is a distinctive boys' name in England & Wales, ranking #610 in 2021 with 61 recorded births. This places Fionn in the top 10% of ranked UK boys' names for the year. Its actual usage is classified as Uncommon. The name reached its all-time peak in 2022 with 69 births ranking #555. Since 1996, the popularity has increased by 369.2%. In 2021, approximately 1 in every 4,836 boys born was named Fionn. STABLE Recent data shows the name is currently stable.